import React, { Component, lazy, Suspense } from 'react'
import { Link, Route } from 'react-router-dom'

// import About from './About'
// import Home from './Home'

import Loading from './Loading'
const Home = lazy(() => import('./Home'))
const About = lazy(() => import('./About'))

export default class Demo extends Component {
  render() {
    return (
      <div>
        <div className="row">
          <div className="col-xs-offset-2 col-xs-8">
            <div className="page-header"><h2>React Router Demo</h2></div>
          </div>
        </div>
        <div className="row">
          <div className="col-xs-2 col-xs-offset-2">
            <div className="list-group">

              {/* 原生html中，靠<a></a>标签跳转不同的页面 */}
              {/* <a className="list-group-item active" href="./about.html">About</a>
                            <a className="list-group-item" href="./home.html">Home</a> */}

              {/* 在React中靠路由链接实现切换组件--编写路由链接 */}
              {/* History模式 */}
              <Link className="list-group-item" to="/about">About</Link>
              <Link className="list-group-item" to="/home">Home</Link>
              {/* Hash模式 */}
              {/* <HashRouter>
                                <Link className="list-group-item" to="/about">About</Link>
                                <Link className="list-group-item" to="/home">Home</Link>
                            </HashRouter> */}

            </div>
          </div>
          <div className="col-xs-6">
            <div className="panel">
              <div className="panel-body">
                <Suspense fallback={<Loading />}>
                  {/* 注册路由 */}
                  <Route path="/about" component={About} />
                  <Route path="/home" component={Home} />
                </Suspense>
              </div>
            </div>
          </div>
        </div>
      </div >
    )
  }
}
